Harry michel



(No Model.)

H. MICHEL. CHISEL HOLDER FOR FILE CUTTING MACHINES. No. 390,793.Patented Oct. 9, 1888.

WITNESSES INVENTOR- HARRY MICHEL, OF DETROIT, MICHIGAN, ASSIGNOR OF ONEHALF TO EDVARD MABKHAM, OF SAME PLACE.

CHiSEL -HOLDER FOR FILE-CUTTiNG MACHINES.,

SPECIFICATION forming part of Letters Patent No. 390,793, dated October9, 1888.

Application filed November 10,1887. Renewed September 11, 1888. SerialNo. 285.164. (X model.)

To aZZ whom it may concern.-

Be it known that I, HARRY MICHEL, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in FileCutting Machines; and I dodeclare the following to be a full, clear, and exact description oftheinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification.

My invention consists of the combinations of devices and applianceshereinafter speci fied, and more particularly pointed out in the claims.

In the drawings, Figure l is a sectional view at right angles to theaxis of the tool-chuck of file cutting mechanism embodying my invention.Fig. 2 is a side elevation of the same. Fig. 3 is a front elevation ofthe same,and Fig. 4- a sectional view by a vertical plane parallel withthe axis of the tool-chuck.

' Heretofore in file-cutting machines the hammerhead has been providedat its end with means for direct connection thereto of the tool ortool-holder. Means have also been provided for permitting the toolitself or toolholder to yield slightly as the tool enters the steel orfile metal, and a spring or springcushion has been employed forreturning the tool to its normal position as the hammer-head is againraised. lVhere means have been thus provided, however, the tool-holderitself has usually been of expensive construction, necessitating, incase of injury to the said holder, at considerable outlay for renewaland repairs.

It is the purpose of my invention to produce an improved construction inwhich there is provided a toolchuck, which chuck is adapted to yield asthe tool enters the steel or file metal, and with a cushion or springadapted to throw the said tool-chuck back into its normal position asthe hammer-head rises. This chuck is adapted to recede and engage thetool-holder, so that if in the operation of the machine the tool-holderbecomes broken or damaged this tool-holder may be taken out or renewedwithout the expense of repairing or renewing the yielding chuck.

In carrying out my invention, A represents the hammer-head of anyfile-cutting machine.

A are guides adapted to engage the framework in which the hammer-headreciprocates.

Bis the cutting-tool.

C is the tool-holder.

Now, instead of making the tool-holder itself to yield in relation tothe hammer-head, and instead of providing a spring or cushion whichshall act directly upon the tool-holder, I provideatoolehuclnD, intowhich the tool-holder is engaged in any suitable manner-as, forinstance, by a cylindrical stem or shank, 0', whereby the tool-holdermay be rotated,and a set screwfi may hold it in any fixed position. Thetool-chuck Dis made cylindrical upon its upper surface and at its endisjournaled to the han'imer-head, as shown at d.

E is a cushion interposed between the hammer-head and the toolchuek D. Aplate, E, serves to hold the cushion in place.

The operation of the device is as follows:

Y The tool as it strikes the steel or file-metal will yield, as shown bythe dotted lines in Fig. 1, by the chuck D compressing the cushion E, asshown by dotted linesin Fig. 1. Then asthe hammer-head rises the cushionwill return the chuck and tool to their normal position.

The cushion E is in the drawings represented as a piece or block ofrubber; but this may be varied to any exten Thus, for instance, insteadof a block of rubber and the plate E for holding it in place, thisportion of the hammer-head might be drilled and a spiral spring beintroduced into the orifice and serve precisely the same purpose and actin the same way as the rubber block; or a spring might be located in anyother convenient way, so as to react and force the tool-chuck back toits normal position. This construction enables the use ofa much shortertool holder and tool, and .brings the tool-holder close to the work.

\Vhat I claim is 1. The combination, with the hammer-head of afile-cutting machine, of a tool-holder, said holder engaged with ayielding tool-chuck,and a spring or cushion adapted to return said chuckto its normal position as the hammerhead is raised, substantially asdescribed.

2. The combination, with a hammer-head I00 mal position as the hammerhead is raised, substantially as described.

4. In a file-cutting machine, the combination, with a hammerhead, A, ofa tool-holder, G, yielding chuck D, and cushion or springild,substantially as described.

In testimony whereof I sign this speci fication in the presence of twowitnesses.

HARRY MICHEL.

Nitnesses:

SAMUEL E. THOMAS, M. B. ODOGHERTY.

